If you want to explore the header situation, you must have this
http://www.maxracesoftware.com/pipemax36xp2.htm
This is Larry Meaux's new baby. Larry is not an engine builder but a head , intake, exhaust guy. He has spent many years working on this and is one of the smartest people I know.
Greg
If you don't know Larry , go to his forum. You ask a question and he will give you a solid answer.